JP2012047074A - Vane pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vane pump that improves pump efficiency.SOLUTION: The vane pump 1 includes: a rotation part 4 in which a slit 7 for slidably accommodating a vane 8 is radially formed; and a casing 3 which has an inner surface 3a in slide contact with the vane 8. A projection 8b is provided on the vane 8. A groove 3g in which the projection 8b slidably fits is provided in the casing 3.

Description

  The present invention relates to a vane pump.

  Conventionally, a casing in which a pump chamber is formed, a rotor that rotates in the casing, a plurality of vanes that are provided in the rotor so as to be able to enter and exit in the radial direction of the rotation shaft, and that divide the pump chamber in the casing into a plurality of parts, (For example, refer to Patent Document 1).

  In Patent Document 1, a guide groove is provided in the casing, a protruding member is formed on the vane, and the protruding member is loosely fitted into the guide groove through a collar formed of a soft material, so that the radial direction of the vane is increased. The protrusion is limited to reduce the sliding resistance.

JP-A 52-126510

  However, in the conventional vane pump, since the protruding member is loosely fitted in the guide groove, when the pressure in the pump chamber increases, the vane may be pushed back inward in the radial direction and the pump performance may be reduced. there were.

  Then, an object of this invention is to obtain the vane pump which can improve pump efficiency more.

  According to the present invention, a vane accommodating portion that slidably accommodates a vane is formed in a rotating portion that rotates in the casing, and the vane is formed in the casing while rotating the vane accommodating portion by rotating the rotating portion. The vane pump that is in sliding contact with the inner surface is characterized in that a projecting portion is provided on the vane and a groove is provided in the casing so that the projecting portion is slidably fitted.

  According to the present invention, the vane is provided with the protruding portion, and the groove is provided in the casing so that the protruding portion is slidably fitted. Therefore, the vane can be prevented from being pushed back radially inward, and the pump efficiency can be further improved.

FIG. 1 is a cross-sectional view in a cross section orthogonal to the rotation axis of the vane pump according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the vane pump according to the first embodiment of the present invention, including a rotating shaft. FIG. 3 is an exploded perspective view of the vane pump according to the first embodiment of the present invention. FIG. 4 is an enlarged view of a part of FIG. FIG. 5 is an enlarged perspective view of the rotating part of FIG. FIG. 6 is a perspective view of the vane according to the first embodiment of the present invention. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a perspective view of a vane according to the second embodiment of the present invention. 9 is a cross-sectional view taken along line BB in FIG. FIG. 10: is sectional drawing in the cross section containing the rotating shaft of the vane pump concerning 3rd Embodiment of this invention. FIG. 11 is a plan view of a ring according to the third embodiment of the present invention. FIG. 12: is sectional drawing in the cross section containing the rotating shaft of the vane pump concerning 4th Embodiment of this invention. FIG. 13 is a perspective view of a vane according to the fourth embodiment of the present invention. 14 is a cross-sectional view taken along the line CC of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that similar components are included in the following embodiments. Therefore, in the following, common reference numerals are given to those similar components, and redundant description is omitted.

(First embodiment)
FIGS. 1-7 is the figure which showed the vane pump concerning 1st Embodiment of this invention. In the following, for the sake of convenience, the upper side of FIGS. 2 to 4 is the one axial side of the rotation axis Ax, and the lower side is the other axial side. First, with reference to FIG. 1, the structure regarding the suction | inhalation and discharge of the working fluid of the vane pump 1 is demonstrated.

  In the vane pump 1 according to the present embodiment, as shown in FIG. 1, a rotating part 4 that rotates around a substantially cylindrical inner peripheral surface 3 a of an annular ring (casing) 3 and a rotation axis Ax in a casing 2. An annular chamber 6 for storing a working fluid (liquid) is formed between the outer peripheral surface 5 a of the substantially cylindrical base body 5. The width w of the annular chamber 6 changes along the circumferential direction of the rotation axis Ax. In the present embodiment, the center C of the inner peripheral surface (inner surface of the casing) 3a is shifted parallel to the left side from the rotation axis Ax, and the inner peripheral surface 3a of the ring 3 and the base portion 5 of the rotating portion 4 are eccentric. . For this reason, the width w of the annular chamber 6 is minimum at the right end position in FIG. 1, gradually increases in the clockwise direction from the right end position, and becomes maximum at the left end position, from the left end position to the right end position. It gradually becomes narrower gradually in the clockwise direction.

  A plurality of (four in this embodiment) slits (vane accommodating portions) 7 that extend radially with respect to the rotation axis Ax of the rotating portion 4 and open in the radially outward direction are formed in the base portion 5. The slit 7 accommodates a vane 8 having a substantially square bar shape or a substantially strip plate shape so as to be slidable. The vane 8 rotates together with the rotating portion 4 while being in sliding contact with the inner peripheral surface 3a.

  The annular chamber 6 is divided into the same number (four in this embodiment) of pump chambers 9 by a plurality of vanes 8 arranged at a constant pitch in the circumferential direction. With the rotation of the rotating unit 4 and the vane 8, the volume of the pump chamber 9 changes according to the change in the width w of the annular chamber 6. That is, the volume of each pump chamber 9 is minimum at the right end position in FIG. And it increases gradually with the rotation to the rotation direction RD (clockwise direction of FIG. 1) of the rotation part 4, and becomes the maximum in the position of a left end. When the rotating unit 4 further rotates in the clockwise direction from that position, the volume of the pump chamber 9 gradually decreases and becomes the minimum at the right end position. That is, in this embodiment, the volume of the pump chamber 9 is expanded in the lower half section of FIG. 1 in one rotation of the rotating unit 4, and the volume of the pump chamber 9 is decreased in the upper half section. Therefore, the suction opening 11 is provided on the inner peripheral surface 3a of the ring 3 and the casing 2 (first casing 10) so as to face the section in which the volume of the pump chamber 9 increases, and the volume of the pump chamber 9 is reduced. A discharge opening 12 is provided facing the section. The suction opening 11 communicates with the suction passage 14 in the suction pipe 13 projecting on the side surface of the first casing 10, and the discharge opening 12 is in the discharge pipe 15 projecting in parallel with the suction pipe 13. It communicates with the discharge passage 16.

  Therefore, in FIG. 1, when the rotating unit 4 rotates in the rotation direction RD, the pump chamber 9 partitioned by the two adjacent vanes 8 moves from the right end position to the left end position while increasing the volume. Therefore, the working fluid flows into the pump chamber 9 from the suction passage 14 via the suction opening 11. The pump chamber 9 moves from the left end position to the right end position while reducing the volume. For this reason, the working fluid flows out from the pump chamber 9 to the discharge passage 16 through the discharge opening 12. Such inflow and outflow of the working fluid are sequentially performed with respect to the plurality of pump chambers 9, and thus continuous suction and discharge of the working fluid by the vane pump 1 is realized.

  Next, with reference to FIGS. 1-7, the structure of each part of the vane pump 1 concerning this embodiment is demonstrated in detail.

  As shown in FIG. 2, the slit 7 formed in the base portion 5 of the rotating portion 4 is closed by the bottom wall portion 17 on the other side in the axial direction, and the vane 8 slides on the bottom wall portion 17. It reciprocates in the slit 7 in contact. The bottom wall portion 17 is formed with a communication hole 17a communicating with the inner diameter of the slit 7, and the back side (the other side in the axial direction) of the bottom wall portion 17 is formed in the slit 7 through the communication hole 17a. From the above, a pressurized pressure of the working fluid is introduced.

  The bottom wall portion 17 is formed in a disc shape centering on the rotation axis Ax and orthogonal to the rotation axis Ax, and projects in a flange shape from the outer peripheral surface 5a of the base portion 5 to the outside. A substantially cylindrical skirt portion 18 projects from the outer peripheral edge of the bottom wall portion 17. The skirt portion 18 is concentric with the rotation axis Ax and protrudes with a substantially constant thickness toward the side away from the base portion 5 (the other side in the axial direction).

  The skirt portion 18 functions as a rotor (rotor) of the motor 19 that drives the rotating portion 4, and corresponds to the teeth 20 a of the stator core 20 around which the coil is wound. It includes a magnetized portion 18a having poles alternately magnetized. At least a portion of the skirt portion 18 that functions as the magnetized portion 18a is made of a magnetic material. In this case, only the portion of the skirt portion 18 facing the teeth 20a may be made of a magnetic material (for example, a hard magnetic material such as a ferrite magnet or a samarium cobalt magnet), or the entire skirt portion 18 may be made of a magnetic material. Alternatively, the entire rotating unit 4 may be made of a magnetic material. In this case, the rotating part 4 and the skirt part 18 can be formed by mixing a resin material with a powdery or granular magnetic filler made of a magnetic material.

  As shown in FIGS. 1 and 3, the outer peripheral surface 5a of the base portion 5 is recessed in the radially inward direction at a constant pitch, whereby a blade portion 5b is formed. The blade portion 5b rotates together with the base portion 5 (rotating portion 4), improves the suction performance of the working fluid into the pump chamber 9 when facing the suction opening 11, and from the pump chamber 9 when facing the discharge opening 12. The discharge performance of the working fluid is improved.

  As shown in FIG. 2, a bearing portion 22 that rotatably supports the shaft 21 is fixed to the central portion of the base body portion 5 (rotating portion 4). The bearing portion 22 may be a sliding bearing such as a metal bush, or may be a rolling bearing such as a needle bearing.

  The rotating unit 4 is configured to rotate about the rotation axis Ax in an internal space 2a (see FIG. 2) formed by the casing 2. In the present embodiment, the casing 2 includes a first casing 10 located on one axial side (the upper side in FIGS. 2 and 3) and a first casing 10 located on the other axial side (the lower side in FIGS. 2 and 3). 2 and the ring 3 forming the outer peripheral surface of the annular chamber 6 (the inner peripheral surface 3a of the ring 3).

  As shown in FIG. 3, the ring 3 includes a cylindrical portion 3 b that forms the outer peripheral surface of the annular chamber 6, and a flange portion 3 c that projects from the other axial side of the cylindrical portion 3 b in the radially outward direction of the rotation axis Ax. And a rib 3d that forms part of the side walls of the suction passage 14 and the discharge passage 16. The cylindrical portion 3b and the rib 3d are erected at substantially the same height in the axial direction of the rotation axis Ax from the disc-shaped annular flange portion 3c.

  As shown in FIG. 2, the ring 3 is accommodated in a recess 10 b formed in the first casing 10. That is, the concave portion 10b is formed in a shape that fits the cylindrical portion 3b of the ring 3 and the rib 3d. Further, the outer peripheral portion 3e of the flange portion 3c of the ring 3 is in contact with the annular wall portion 23a of the second casing 23 on the opposite side of the concave portion 10b, and this portion is in contact with the first casing 10 and the second casing 23. The ring 3 is fixed in the axial direction of the rotation axis Ax.

  The second casing 23 includes a substantially annular recess 23b that accommodates the skirt portion 18 of the rotating portion 4, and the second casing 23 side (the other axial side, FIG. A recess 23c is formed to accommodate a portion projecting to the lower side of FIG.

  A region outside the annular wall portion 23a on the outer periphery of the concave portion 23b is a contact surface with the first casing 10. A groove portion 23d for the O-ring 34 is formed in a substantially annular shape on the abutting surface, and the O-ring 34 mounted in the groove portion 23d is used at the boundary portion between the first casing 10 and the second casing 23. The seal is secured. In addition, a seal member (for example, a gasket, an O-ring, or the like) is appropriately interposed also in a boundary portion (for example, a boundary surface between the flange portion 3c of the ring 3 and the first casing 10) between the members other than the boundary portion. The sealing performance of each boundary portion may be improved.

  A shaft 21 is installed between the bottom wall 23e of the recess 23c and the protrusion 10c of the first casing 10, and the center of the shaft 21 is a rotation axis Ax. The shaft 21 passes through a bearing portion 22 provided at the center of the rotating portion 4 and is rotatably supported by the bearing portion 22.

  In addition, as shown in FIG. 2, a protrusion is provided between the recess 23 b and the recess 23 c from the opposite side of the rotating part 4 (the other side in the axial direction, the lower side in FIG. 2) toward the rotating part 4. An annular protrusion 23f is formed, and the stator core 20 constituting the motor 19 is accommodated in an annular recess 23j on the back side of the protrusion 23f.

  The stator core 20 is attached to the center of the surface 24a of the substrate 24, as shown in FIGS. 2 and 3, and extends radially from the cylindrical portion 20b concentrically with the rotational axis Ax and the cylindrical portion 20b. And a plurality of teeth 20a around which a coil is wound.

  Various electronic components (not shown) are mounted on the back surface 24b opposite to the front surface 24a of the substrate 24 on which the stator core 20 is provided (the other side in the axial direction, the lower side in FIG. 2). Drive circuits and other circuits are formed. In the present embodiment, the energization state of the coil wound around each tooth 20a is appropriately switched by the drive circuit formed on the substrate 24 to switch the polarity in the outer peripheral portion of the tooth 20a, and thereby the diameter relative to the tooth 20a. A circumferential thrust is applied to the magnetized portion 18a (skirt portion 18) opposed to the outer direction, so that the rotating portion 4 is rotated. Therefore, in the second casing 23, at least the partition wall portion 23 g interposed between the outer peripheral portion of the stator core 20 (the teeth 20 a) and the skirt portion 18 needs to have magnetic permeability. For this reason, the whole partition part 23g or the 2nd casing 23 is formed with the material (for example, stainless steel, resin material, etc.) which has magnetic permeability.

  The substrate 24 is attached so as to block the concave portion 23c from the opposite side (the other axial side) of the rotating unit 4, and further, the substrate 24 is attached to the opposite side of the rotating unit 4 by the substrate cover 25 (the other axial direction). It is covered from the side). The board cover 25 is provided with ridges 25 a in order to secure an interval for arranging electronic components between the board 24 and the board 24.

  Both the first casing 10 and the second casing 23 have a substantially square outer shape when viewed in the axial direction along the rotation axis Ax. And the through-holes 10a and 23k of the screw 26 which fastens these at the four corners of these casings 10 and 23 are formed. The vane pump 1 is assembled by inserting the screws 26 into the through holes 10a and 23k and the through holes 25b formed at the four corners of the substrate cover 25 and screwing the nuts 27 together.

  The material and manufacturing method of each component constituting the vane pump 1 are appropriately selected in consideration of wear resistance, corrosion resistance, swelling resistance, moldability, component accuracy, etc. in addition to the above-described magnetization and permeability. Is done.

  Further, in the present embodiment, the rotating unit 4 is provided with a fluid force generating unit 28 that generates a fluid force toward one side (upper side in FIGS. 2 and 3) of the rotating shaft Ax along with the rotation. The rotating portion 4 is pressed against the first casing 10 located on the side opposite to the side on which the bottom wall portion 17 is provided. The fluid force generator 28 is provided on the end surface 18 b on the other axial side of the skirt 18 as an inclined surface that is inclined with respect to the rotational direction RD of the rotating unit 4. The inclined surface is set to be inclined from the other side in the axial direction toward one side (from the lower side to the upper side in FIG. 3) from the front side to the front side in the rotational direction RD. For this reason, the working fluid hitting this inclined surface as the rotating unit 4 rotates causes a fluid force to act on the rotating unit 4 and pushes it up in one axial direction (the upper side in FIG. 3).

  Then, in order to slidably support the rotating portion 4 that rotates while receiving fluid force (thrust) acting toward one side in the axial direction, the first casing 10 has a thrust as shown in FIG. A support portion 29 is provided. Specifically, a projection 10c is formed by projecting a portion in which the shaft 21 is inserted and supported in the first casing 10 to the other side in the axial direction, and a washer 30 is provided on the top surface 10d of the projection 10c. Thus, the bottom surface 4b of the recess 4a formed at the center of the rotating part 4 (base part 5) is abutted. In the present embodiment, the washer 30 is interposed in the thrust support portion 29, and the axial end surface 22a of the bearing portion 22 provided in the central portion of the rotating portion 4 (partly exposed on the bottom surface 4b of the recess 4a). It is easy to improve the wear resistance. That is, with this configuration, the wear resistance of this portion is adjusted by the specifications (material, dimensions, curing treatment, etc.) of the sliding contact portion between the washer 30 and the bearing portion 22, and the main body portion (base portion 5, The specifications of the bottom wall portion 17 etc. can be selected from the viewpoints of weight reduction, slidability of other sliding portions, corrosion resistance, and the like.

  As shown in FIG. 4, the diameter D <b> 2 of the sliding portion in the thrust support portion 29 is made smaller than the diameter D <b> 1 of the base portion 5. In the case where the fluid force generating portion 28 is provided, if no special thrust supporting portion is provided, the end surface 5c of the base portion 5 is in sliding contact with the first casing 10, and the sliding resistance may increase. There is. In this respect, in this embodiment, since the diameter D2 of the sliding portion is smaller than the diameter D1 of the base portion 5, the sliding resistance can be further reduced and the friction can be further reduced.

  As shown in FIG. 2, the gap 31 between the end surface 17b on one side in the axial direction of the bottom wall portion 17 and the end surface 3f on the other side in the axial direction of the ring 3 is set narrow, and the space between these end surfaces 17b and 3f is set. The leak flow rate from the gap is reduced as much as possible. A washer 30 is also interposed on the other axial side of the bearing portion 22.

  In the present embodiment, four vanes 8 are used for the vanes 8 corresponding to the slits 7 formed in the base portion 5 of the rotating portion 4, and each vane 8 extends along the opening of the slit 7. The shape, that is, a substantially square bar shape (band plate shape) having a long side of the side wall portion 8s in the rotation direction RD in the accommodated state of the slit 7 is formed.

  Here, in this embodiment, as shown in FIGS. 5 to 7, each vane 8 is provided with a protruding portion 8 b. And the groove part which the protrusion part 8b of each vane 8 fits so that sliding is possible is provided in the casing.

  Specifically, a substantially arc-shaped protruding portion 8 b is provided so as to protrude radially outward from the sliding contact surface 8 a of the vane 8, and the protruding portion 8 b of each vane 8 is provided on the other axial side of the ring 3. Is provided with an annular groove 3g that is slidably fitted.

  With this configuration, when the rotating portion 4 is rotated, the vane 8 causes the slidable contact surface 8a to ring with the protruding portion 8b provided on the vane 8 fitted in the groove portion 3g of the ring 3. 3 while rotating in sliding contact with the inner peripheral surface 3 (inner surface of the casing) 3a.

  As described above, in the present embodiment, the protrusion 8b is provided on the vane 8, and the groove 3g in which the protrusion 8b of the vane 8 is slidably fitted is provided in the ring (casing) 3. Yes. Therefore, it is possible to suppress the vane 8 from being pushed back radially inward when the pressure in the annular chamber 6 increases. As a result, it is possible to maintain the sliding contact between the sliding contact surface 8a of the vane 8 and the inner peripheral surface (inner surface of the casing) 3a of the ring 3 when the rotating unit 4 rotates, that is, during operation of the vane pump 1. Pump efficiency can be further improved.

  Moreover, in this embodiment, the groove part 3g which the protrusion part 8b of the vane 8 fits slidably to the ring 3 in which the inner peripheral surface (inner surface of the casing) 3a with which the vane 8 is slidably contacted is formed. Is provided. Therefore, it is possible to prevent a gap from being formed between the sliding contact surface 8a of the vane 8 and the inner peripheral surface (inner surface of the casing) 3a of the vane 8 due to an assembly error of the vane pump 1, etc. It can suppress that efficiency falls.

  In addition, since the protruding portion 8b formed on the vane 8 is slidably fitted directly into the groove portion 3g, it is possible to suppress an increase in the number of parts and to reduce costs. Become.

(Second Embodiment)
The vane pump 1 according to the present embodiment basically has the same configuration as that of the first embodiment. The vane 8A is provided with a protruding portion 8b, and the ring (casing) 3 has a protruding shape of the vane 8A. A groove portion 3g is provided in which the portion 8b is slidably fitted.

  Here, the main difference between the present embodiment and the first embodiment is that, as shown in FIG. 8 and FIG. The portion 8c including 8a is formed of a wear material that is more easily worn than the other portion 8f of the vane 8.

  As this wear material, for example, polyphenylene sulfide (PPS), polyphenylene ether (PPE), or the like can be used. At this time, it is preferable to select the wear material appropriately in consideration of chemical resistance to the fluid, heat resistance to the usage environment of the vane pump, and the like.

  In this embodiment, as shown in FIGS. 8 and 9, the width of the portion 8 c including the sliding contact surface 8 a is provided on the protruding portion 8 d that protrudes radially inward (on the other portion 8 f side) from one side in the axial direction to the other side. It is formed in the center of the direction. The other portion 8f is formed with a recess 8e into which the protruding portion 8d is fitted. By fitting the protruding portion 8d into the recessed portion 8e, the portion 8c including the sliding contact surface 8a and the other portion 8f. Are combined together.

  Note that the part 8c including the sliding contact surface 8a and the other part 8f may be integrally coupled by an adhesive or the like, or may be integrally coupled by two-color molding.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

  Further, according to the present embodiment, the part 8c including the sliding contact surface 8a that is in sliding contact with the inner peripheral surface (inner surface of the casing) 3a of the ring 3 of the vane 8A is more easily worn than the other part 8f of the vane 8. Since it is made of a wear material, the portion 8c including the sliding contact surface 8a can be selectively worn. Therefore, even if the angle between the sliding contact surface 8a of the vane 8A and the inner peripheral surface (inner surface of the casing) 3a of the ring 3 is different due to errors during manufacturing or assembly, the portion including the sliding contact surface 8a. By wearing 8c, the angle between the sliding contact surface 8a of the vane 8A and the inner peripheral surface (inner surface of the casing) 3a of the ring 3 can be matched.

  Thus, by matching the angle between the sliding contact surface 8a of the vane 8A and the inner peripheral surface (inner surface of the casing) 3a of the ring 3, the sliding contact surface 8a of the vane 8A and the inner peripheral surface of the ring 3 (of the casing) It is possible to suppress the formation of a gap between the inner surface 3a and the pump efficiency.

(Third embodiment)
The vane pump 1 according to the present embodiment has basically the same configuration as that of the first embodiment described above, and the vane pump 1 according to the present embodiment has a protrusion 8b on the vane 8A and a ring (casing). 3B is provided with a groove 3g into which the protruding portion 8b of the vane 8A is slidably fitted.

  Here, the main difference between the present embodiment and the first embodiment is that, as shown in FIGS. 10 and 11, a portion including the inner peripheral surface (inner surface of the casing) 3a of the ring (casing) 3B is changed to a vane. This is because it is made of a wear material that is more easily worn than 8.

  Also in the present embodiment, as in the second embodiment, for example, polyphenylene sulfide (PPS), polyphenylene ether (PPE), or the like can be used as the wear material. Also in the present embodiment, it is preferable to select a wear material as appropriate in consideration of chemical resistance to fluid, heat resistance to the usage environment of the vane pump, and the like.

  In this embodiment, the ring (casing) 3B is, as shown in FIGS. 10 and 11, a wear material portion (a portion including the inner surface 3a of the casing) constituting the main body portion 3h and the inner peripheral surface (inner surface of the casing) 3a. 3i is integrally formed. The main body portion 3h and the wear material portion 3i may be integrally coupled with an adhesive or the like, or may be integrally coupled by two-color molding.

  In the present embodiment, the vane 8 shown in the first embodiment is used.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

  Moreover, according to this embodiment, since the wear material part (part including the inner surface 3a of the casing) 3i of the ring (casing) 3B is formed of the wear material that is more easily worn than the vane 8, the ring (casing). The inner peripheral surface (inner surface of the casing) 3a side of 3B can be selectively worn. Therefore, even if the angle between the sliding contact surface 8a of the vane 8 and the inner peripheral surface (inner surface of the casing) 3a of the ring 3B is different due to errors during manufacturing or assembly, the inner peripheral surface 3a of the ring 3B. By wearing the side, the angle between the sliding contact surface 8a of the vane 8 and the inner peripheral surface 3a of the ring 3B can be matched.

  In this way, by matching the angles of the sliding contact surface 8a of the vane 8 and the inner peripheral surface (inner surface of the casing) 3a of the ring 3B, the sliding contact surface 8a of the vane 8 and the inner peripheral surface of the ring 3B (of the casing) It is possible to suppress the formation of a gap between the inner surface 3a and the pump efficiency.

(Fourth embodiment)
The vane pump 1 according to the present embodiment has basically the same configuration as that of the first embodiment described above, and a protrusion is provided on the vane 8C, and the protrusion of the vane 8C is slidable on the casing. The groove part which fits in is provided.

  Here, this embodiment is mainly different from the first embodiment in that, as shown in FIGS. 12 to 14, a protruding portion 8 g that protrudes on one side in the axial direction is provided on the radially outer side of the vane 8 </ b> C. At the same time, a groove 10e into which the protruding portion 8g is slidably fitted is provided on the other axial side of the first casing 10.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications can be made.

  For example, in the fourth embodiment, as the vane and the ring, those that are not formed of a wear material that easily wears are illustrated. However, as shown in the second embodiment, the portion including the sliding contact surface of the vane is used. It is also possible to form the wear material more easily than other parts of the vane. Further, as shown in the third embodiment, it is also possible to form the portion including the inner peripheral surface of the ring (the inner surface of the casing) with a wear material that is more easily worn than the vane.

  Further, the specifications (shape, size, layout, etc.) of the rotating part, casing, and other details can be changed as appropriate.

1 Vane pump 2 Casing 3, 3B Ring (casing)
3g Groove part 3i Wear material part 4 Rotating part 7 Slit (vane accommodating part)
8, 8A, 8C Vane 8b, 8g Projection 10 First casing (casing)
10e Groove Ax Rotating shaft RD Rotation direction (circumferential direction)

Claims (3)

A vane accommodating portion that slidably accommodates a vane is formed in a rotating portion that rotates within the casing, and the rotating portion is rotated so that the vane slides on the inner surface formed in the casing while sliding the vane accommodating portion. In vane pumps that are in sliding contact,
A vane pump characterized in that a projecting portion is provided on the vane and a groove portion is provided in the casing so that the projecting portion is slidably fitted.   The vane pump according to claim 1, wherein a portion including a sliding contact surface that is in sliding contact with the inner surface of the vane is formed of a wear material that is more easily worn than other portions of the vane.   3. The vane pump according to claim 1, wherein a portion including the inner surface of the casing is formed of a wear material that is more easily worn than the vane.

Images